Frequently asked questions

What causes red thread and which turf situations are most commonly affected?

Red thread (Laetisaria fuciformis) is a foliar disease that thrives on nitrogen-deficient turf during mild, humid conditions, typically between 15 and 25°C. It is most common on perennial ryegrass, fine fescue, and cool-season grasses on sports fields, council-managed parklands, and lower-input amenity turf. Red thread rarely kills the grass plant. It damages leaf tissue but does not attack the crown or roots, so recovery is typically straightforward once the underlying nutrient deficiency is corrected.

How do I confirm red thread in the field?

Look for irregular patches of tan or bleached turf, 50 mm to 300 mm across, with distinctive coral-pink to red thread-like fungal structures (sclerotia) extending from the leaf tips. These pink-red threads are the key diagnostic feature and are most visible in early morning dew. Red thread is sometimes confused with pink patch (Limonomyces roseipellis), which produces a similar pink gelatinous growth but lacks the thread-like structures.

Is fungicide always necessary for red thread control?

In most cases, red thread can be managed culturally without fungicide. Applying nitrogen fertiliser to correct the underlying deficiency and stimulate growth allows the plant to outgrow the infection. For severe outbreaks on high-specification surfaces, fungicide intervention may be warranted. Contact Greenway Turf Solutions to discuss whether a cultural or chemical approach is best for your situation.